RxJava2 / RxAndroid2操作符distinct与distinctUntilChanged去重结果异同
RxJava2 / RxAndroid2操作符distinct与distinctUntilChanged去重结果异同
代码例如：
package zhangphil.app;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.observers.DisposableObserver;
import io.reactivex.schedulers.Schedulers;
public class MainActivity extends AppCompatActivity {
private final String TAG = getClass().getSimpleName();
private CompositeDisposable mCompositeDisposable = new CompositeDisposable();
private Integer[] test_data = {
1, 1, 2, 3, 4, 5, 2, 5, 3, 6, 4, 7, 7, 8, 9
}; // 故意设置若干重复的数据，等待去重复数据
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
test();
}
private void test() {
Observable<Integer> observable1 = Observable.fromArray(test_data);
Observable<Integer> observable2 = Observable.fromArray(test_data);
mCompositeDisposable.addAll(observable1
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.distinct()
.subscribeWith(getObserver(0)),
observable2
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.distinctUntilChanged()
.subscribeWith(getObserver(1)));
}
private DisposableObserver getObserver(final int id) {
DisposableObserver disposableObserver = new DisposableObserver<Object>() {
@Override
public void onNext(Object o) {
Log.d(id + TAG, "#####开始#####");
Log.d(id + "数据", String.valueOf(o));
Log.d(id + TAG, "#####结束#####");
}
@Override
public void onComplete() {
Log.d(id + TAG, "onComplete");
}
@Override
public void onError(Throwable e) {
Log.e(id + TAG, e.toString(), e);
}
};
return disposableObserver;
}
@Override
protected void onDestroy() {
super.onDestroy();
// 如果退出程序，就清除后台任务
mCompositeDisposable.clear();
}
}
运行结果输出：
05-18 10:57:55.069 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 1 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 2 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 3 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 4 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 5 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 6 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 7 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 8 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0数据: 9 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/0MainActivity: onComplete 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 1 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 2 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.070 4374-4374/zhangphil.app D/1数据: 3 05-18 10:57:55.070 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 4 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 5 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 2 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 5 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 3 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 6 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 4 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 7 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 8 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####开始##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1数据: 9 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: #####结束##### 05-18 10:57:55.071 4374-4374/zhangphil.app D/1MainActivity: onComplete